Abstract: A method according to an exemplary aspect of the present disclosure includes, among other things, periodically adjusting powertrain operation of an electrified vehicle equipped with an internal combustion engine to progressively influence oil quality of oil of the internal combustion engine.

Abstract: A method for operating a transmission device for a motor vehicle. A drive gear is selected from a drive gear set and set on a transmission and upon going above a rotational speed upper limit a drive gear with a larger gearing ratio and upon going below a rotational speed lower limit a drive gear with a smaller gearing ratio is selected from the drive gear set and set on the transmission. In a normal operating mode, the drive gear set corresponds to a normal operation drive gear set having a plurality of different drive gears, and the rotational speed upper limit corresponds to a normal operation rotational speed upper limit and the rotational speed lower limit corresponds to a normal operation rotational speed lower limit. In an alternative operating mode the drive gear set corresponds to an alternative operation drive gear set, having a smaller number of different drive gears than the normal operation drive gear set.

Abstract: A valve is configured to control an opening in a passage. A valve angle sensor is configured to send an electric signal according to a rotation angle of the valve. In a storing process, an actual measurement value of a valve angle at a mechanical full open position is stored as an actual full open valve angle. In a first setting process, a first output value at a mechanical full close position is set. In a second setting process, a second output value at the stored actual full open valve angle is set. The output characteristic is set as an angle to output value relation according to the first output value and the second output value.

Abstract: A vehicle includes an internal combustion engine, brake actuators configured to slow the vehicle in response to braking commands, and a transmission. The transmission includes a plurality of gear sets each having a plurality of nodes, an input member that is continuously connected to the engine and to a node of one of the gear sets, a reverse clutch, a binary clutch assembly, and a controller. The binary clutch assembly is connected at least to the same gear set as the input member, and is applied with the reverse clutch when entering a reverse gear state. The controller executes a method to transmit the braking commands to the brake actuators in response to a requested garage shift into a reverse gear state when the vehicle is rolling above a calibrated speed threshold, and thereby slows the vehicle until a calibrated target slip is achieved across the binary clutch assembly.

Abstract: Features for varying speeds available and/or range of operation of transmissions are provided for use in high performance, increased efficiency, and/or other applications. Increased performance and/or efficiency may be obtained by using additional speeds or gear ranges to maintain drivetrain operation within maximum power and/or efficiency bands of internal combustion engine operation.

Abstract: A solenoid valve apparatus includes a solenoid valve and a switching device that switches between a first state in which the working fluid in the pump chamber is discharged when the solenoid valve functions as a regulator valve and a second state in which discharge of the working fluid from the pump chamber is prohibited when the solenoid valve functions as the electromagnetic pump.

Abstract: A hydraulic control device for a multi-speed automatic transmission includes friction engagement elements, several hydraulic servos that engage and release the friction engagement elements, solenoid valves for engagement control, and a sorting switch valve that allocates engagement pressure from at least one of the solenoid valves for engagement control to two of the hydraulic servos. The sorting switch is switched between a first position that supplies engagement pressure to one of the two hydraulic servos in at least a Reverse, non-drive range and a specific Forward gear range, and a second position that supplies engagement pressure to the two hydraulic servos in other than the Forward range.

Abstract: A pressure (p_3) setting system (200) with a pressure control valve (1), comprising a valve gate (10) arranged to be displace in a valve bore (12). The valve bore has at least one pressure chamber (21, 22, 23, 24, 25, 26), in which the valve gate may be axially exposed to a pressure. A first pressure chamber (21) is connected to at least one acceleration-dependent compensation member (203) for full or partial compensation of any pressure (p_3) setting disturbances caused by mass forces (F_a1, F_a2) resulting from the acceleration (a) of the system.

Abstract: A method for shifting a gear into a gear position in an automated shift transmission with several gears and an automated shift transmission adapted to perform said method are suggested. Via a shifting fork, a shifting sleeve can be shifted from a neutral position into respective gear positions and reaches on its way a pull-in position where the shifting sleeve is automatically forced in direction of the gear position. It is achieved that the pull-in position is safely reached by checking whether the shifting fork has reached a first threshold value, a second threshold value, and whether it has come to a standstill therebetween. Accordingly, an increased shifting force can be applied. Albeit allowing production tolerances in the transmission, the respective gear position is safely reached.

Abstract: A hydraulic control system for a vehicular drive system including a hydraulically operated belt-and-pulley type continuously variable transmission and a hydraulically operated frictional coupling device engaged for running of a vehicle, the hydraulic control system including: a first solenoid valve for regulating a belt-tensioning hydraulic pressure for tensioning a belt of the transmission, a second solenoid valve for regulating a transient coupling hydraulic pressure to be applied to the frictional coupling device in the process of an engaging action, a line-pressure regulating valve for regulating a line pressure used for hydraulically operated devices of the mechanism, and a hydraulic-circuit switching device operable to apply a control pressure of the second solenoid-operated valve to the line-pressure regulating valve after the frictional coupling device has been placed in a fully engaged state, and to apply a first control pressure of the first solenoid-operated valve to the line-pressure regulating va

Abstract: A hydraulic control system includes a key detector that detects whether an ignition key is in an on state, a control portion that outputs different control signals according to whether the engine is on if the key is on, and a valve, such as a solenoid valve, that controls gear shifts according to the control signals from the control portion. A hydraulic control method includes determining whether an ignition key is on; determining whether an engine is on or off if the key is on; and controlling a valve, such as a solenoid valve, that controls gear shifts, differently depending on whether the engine is on or off, such as by applying different duty values to the valve. A low duty value may be applied to the valve when the engine is off, and a higher duty value may be applied to the valve when the engine is on.

Abstract: A hydraulic control apparatus for a multi-stage automatic transmission includes solenoid valves such as the linear solenoid valves that are formed as normally closed valves. A first clutch apply relay valves that outputs a forward range pressure as a reverse input pressure during an all-solenoid-off mode, and a second clutch apply relay valve that switches between a left half position that inputs a reverse input pressure to a discharge port and a right half position that inputs the reverse pressure to the discharge port are provided. The second clutch apply relay valve is set to the right half position during normal engine startup and locked based on the lock pressure by feeding the line pressure as a lock pressure and is set at the left half position that interrupts the lock pressure after the engine is restarted during all-solenoids-off.

Abstract: There is provided a shift control device for an automated manual transmission having power transmission lines equipped with respective start clutches and gears. The shift control device includes clutch actuation mechanisms and a transmission shift controller that causes the clutch actuation mechanisms to regulate the clutch engagement forces applied to the start clutches so as to perform clutch changeover upon gear selection for a desired gear range in response to a transmission shift command. Each of the clutch actuation mechanisms has primary and secondary clutch engagement force regulation units.

Abstract: A hydraulic control system for an automatic transmission includes a planetary gear system having a plurality of clutch elements that alters the torque ratio of the transmission. The hydraulic control system includes a line pressure control device for regulating a variable hydraulic line pressure from a maximum line pressure to a fixed fluid line pressure that is lower than the maximum line pressure when an overdrive clutch is applied in a high gear.

Abstract: The hydraulic control system includes a driving condition detection unit, a transmission control unit, and a driving unit. The driving condition detection unit detects driving conditions of a vehicle. The transmission control unit performs variable line pressure control using a minimum line pressure and a line-pressure-decreasing gradient calculated based on driving condition data detected by the driving condition detection unit when the driving conditions satisfy variable line pressure control entrance conditions. The driving unit adjusts a duty ratio of line pressure applied to friction elements according to a line pressure control signal generated by the transmission control unit.

Abstract: A hydraulic control unit including a hydraulic servo for engaging and disengaging each friction engagement element, hydraulic pressure supply device for supplying hydraulic pressure to a hydraulic servo of a predetermined friction engagement element selected according to a gearshift position to be achieved, failure detection device for detecting a failure has occurred in the hydraulic pressure supply device, and fail-safe device for preventing interlock that occurs due to a plurality of friction engagement elements being engaged, and also prevents a gearshift from a high-speed position to a low-speed position, when the failure detection device detects that a failure has occurred.

Abstract: A control current is converted into an activation pressure for a transmission actuator by a pressure regulating valve. Both a control current at a given time and the activation pressure at the given time are fed back to a regulator. A setpoint value for the activation pressure in a partial range of a torque to be transmitted is converted by the regulator into the control current in dependence on the control current at the given time and otherwise as a function of the activation pressure at a given time. The current measuring device for determining the control current at the given time is adjusted here in such a way that a high resolution is obtained in the partial range.

Abstract: An improved automatic shift transmission control method establishes an initial methodology for sharing adaptive corrections among shift parameters stored for related types of shifts, and subsequently modifies the initial methodology as the adapted parameters converge on respective optimum values. Individual shift types are initially categorized to indicate the degree of cross-adaptive correction, and when shift parameter convergence occurs, the shift types are re-categorized, thereby modifying the initial cross-adaptive methodology to restrict further cross-adaptive correction. A given shift type is automatically reset to an initial or prior categorization to permit less restricted cross-adaptive correction if reset conditions are met. In this way, the methodology for sharing adaptive corrections automatically evolves to suit individual transmission operating characteristics and conditions, and effectively prevents degradation of a shift due to sharing of adaptive corrections developed for a related shift.

Abstract: A gearbox of a gear-changing appliance has a frictional connection whose engagement by a hydraulic fluid actuator causes an associated gearbox transmission ratio to be effective. A control pressure derived from the working pressure of the actuator is used to influence a pressure regulating valve for a supply pressure present at a pressure regulating valve which adjusts the working pressure as required by an electronic control unit.

Abstract: An automatic transmission control system controls locking pressure for locking a specific friction coupling element to a target level previously determined according to engine output torque and appropriately changes the target level such that, when an increase in engine output torque occurs, a delay of a locking pressure change relative to an engine output torque change becomes greater after the target level has reached near an appropriate level than before it has reached near the appropriate level.

Abstract: In a control device for an automatic transmission which holds a line pressure solenoid of an automatic transmission in a stationary ON state while an engine is in a stop state, when a key switch is switched ON, "stationary ON control device" supplies a high voltage to the line pressure solenoid for a short time so as to over-excite it, and a holding magnetization of the line pressure solenoid is then maintained by a low voltage. Subsequently, if it is determined by engine rotation speed detection device that a cell motor is being driven, ordinary control is performed wherein an over-excitation, holding magnetization and OFF cycle is repeated. Further, when a battery voltage drops while the cell motor is being driven so that the line pressure solenoid with holding magnetization switches OFF, recovery device rapidly restores the solenoid to the normal stationary ON state by performing intermittent over-excitation.

Abstract: A hydraulic control system for an automatic transmission includes a hydraulic pressure source, a line pressure controller for constantly controlling hydraulic pressure from the hydraulic pressure source, a reducing pressure controller for generating reduced pressure, a damper clutch controller for supplying hydraulic pressure fed from the line pressure controller to a torque converter, a shift controller for converting hydraulic pressure from the line pressure controller into drive pressure corresponding to each speed stage, a hydraulic controller for controlling drive pressure from the shift controller; and a pressure distributer for distributing hydraulic pressure from the hydraulic controller to each friction member for each speed stage by being controlled by drive pressure from the shift controller.

Abstract: A device and a method of a hydraulic control system for 4-speeds automatic transmissions which may reduce line pressure in a steady flow during operation of an automotive vehicle at high speed thereby decreasing the load applied to an oil pump and reducing fuel consumption. And when shifting from the second, third or fourth speed of the "D" range, where the damper clutch operates, to another shift range, which makes it so the line pressure is not changed when the damper clutch is released thereby increasing the load applied to the engine, thereby preventing the run-up of the engine, and when the shift is completed, which changes the line pressure again, thereby improving shift quality and power transmission efficiency.

Abstract: An automatic transmission learning control apparatus comprises a memory for storing parameters in memory locations specified for respective gear shift operation modes. A physical quantity related to a gear shift operation made in the automatic transmission is measured. The parameter stored in the memory location specified by the sensed gear shift operation mode is updated in a direction to bring the physical quantity into agreement with a target value. The parameter to be updated is limited between upper and lower limits set for each of the gear shift operation modes. The parameter stored in the memory location specified by the sensed gear shift operation mode is used to control the gear shift operation.

Abstract: A control system for an automatic transmission for a vehicle provides an enhancement in a shifting characteristic in a manually shifting mode by controlling an operating hydraulic pressure for hydraulic engage elements in an appropriate manner. In a first range from the output of a shifting command to a time point when a timer TOIPU reaches a counting-up value, or a time point when the slip rate ECL of the hydraulic engage elements exceeds a value YECLIPUS, the operating hydraulic pressure is set at a preset value depending upon the type of shifting. In a second range from the end of the first range to a time point when the timer TOIPU reaches a counting-up value, or a time point when a slip rate ECL exceeds a value TECLIPUS, and in a third range from the end of the second range to a time point when a timer TKAK reaches a counting-up value, the operating hydraulic pressure QAT is set at a value corresponding to an engine torque or a transmission input torque.

Abstract: A control system for a multiple ratio transmission including a hydrokinetic torque converter with a pressure actuated friction bypass clutch, pressure actuated clutches and brakes controlling ratio changes in forward drive and for effecting reverse drive, a solenoid operated pressure control that develops an optimum clutch and brake pressure for smooth engagement and for increased torque capacity during start-up, and separate solenoid regulator valves for ratio shift valve control and for bypass clutch pressure control.

Abstract: A hydraulic control system for an automatic transmission of automotive vehicles is provided. The hydraulic control system includes a pressure source, a plurality of solenoid valves, and a plurality of directional control valves. Each solenoid valve selectively supplies and release hydraulic pressure to and from one of frictional element of a power train of the automatic transmission according to a given schedule of transmission operation for establishing a given gear ratio. The directional control valves are interposed between the frictional elements of the power train and the solenoid valves, respectively.

Abstract: An improved adaptive transmission pressure control in which cumulative adaptive corrections are stored in a multi-cell memory array, the cells being associated with specified contiguous ranges of a vehicle operating parameter, such as engine throttle position. Periodically determined adaptive correction amounts are applied to a selected cell which includes the engine throttle setting measured at the initiation of the shift and to two or more cells associated with contiguous engine throttle ranges. In this way, a relatively large number of cells may be employed to minimize approximation errors, while maintaining a cell-to-cell continuum of pressure correction values. In operation, an electro-hydraulic pressure regulator is controlled as a combined function of a predefined pressure command obtained from a normal table look-up and a cumulative correction amount obtained from the memory array.

Abstract: A control system for controlling both: an engine having a plurality of cylinders, a plurality of intake ports formed individually for the cylinders, a plurality of intake valves for opening or closing the intake ports individually for the cylinders, and a control valve for opening or closing one of the intake ports of each of the cylinders; and an automatic transmission connected to the engine. The control system comprises: a valve controller for opening the control valve, when an engine load is high, and for closing the control valve when the engine load is low: an air/fuel ratio controller for making an air/fuel ratio when the control valve is closed higher than that when the control valve is open; and a shift inhibitor for inhibiting the shift in the automatic transmission till a predetermined time period elapses after the switching of the control valve.

Abstract: A fluid pressure control arrangement for an automatic transmission comprises a control unit for calculating a shifting frequency and a determining a frictional coefficient of frictionally engageable elements of the transmission. Fluid pressure correction is calculated based on the shifting frequency and a throttle valve opening angle detected by a sensor. A signal indicative of the fluid pressure correction value is output to actuate a solenoid for effecting adjustment of fluid pressure in the automatic transmission for adjusting the line pressure in accordance with the determined frictional coefficient of the frictionally engageable elements to maintain sufficient engagement capacity of the frictionally engageable elements.

Abstract: A hydraulic control apparatus for an automatic transmission of a motor vehicle, which has a plurality of gear positions that are selectively established by selective operation of hydraulically operated frictional coupling devices. The apparatus includes a pressure regulating device which receives a hydraulic pressure generated by a pressure source and generates a line pressure to be applied to the coupling devices. The pressure regulating device regulates the line pressure on the basis of the detected throttle opening angle of the engine when the vehicle is running in a transient state, and on the basis of the detected intake air quantity of the engine when the vehicle is running in a steady state.